JP2848312B2 - Printed wiring board design change processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a design change processing method for a printed wiring board, and more particularly to a design change processing method for a printed wiring board on which a high-speed operation circuit is mounted.

[0002]

[Prior Art] Design change of printed wiring board (remodeling work)
In some cases, the wiring between component pins is cut at a predetermined cutting position, and the predetermined component pins are connected with jumpers.However, in the case of a printed wiring board on which a high-speed operation circuit is mounted, Unnecessary wiring (hereinafter referred to as “surplus wiring (whisker wiring)”) remaining after cutting the wire causes a problem in electrical characteristics, and an undershoot or overshoot occurs because the wiring connection order is not in one-stroke wiring order. There is a problem that a failure in transmission characteristics such as a chute occurs.

Conventionally, in a design change processing method for a printed wiring board on which this kind of high-speed operation circuit is mounted, CAD (Computing)
er Aided Design, computer-aided design) In the form of dialogue with equipment, etc., manually calculate the extra wiring length from the wiring cutting position to the component pins, and perform wiring at the cutting position where the extra wiring length is within the specified limit. The jumper is cut, and the jumper connection is similarly performed so as to satisfy a predetermined connection order (single-stroke wiring order) by manually designating a jumper connection section.

As a method of changing the design of a printed wiring board relating to the present invention, for example, Japanese Patent Application Laid-Open No. 4-267483 discloses a method for preventing a pattern from being cut under a pad for mounting a surface mounting component. In a processing apparatus for designating a position of a wiring pattern connected to a pad for mounting a surface mounting component of a wiring board, a first information input stage is provided to provide information on the shape and position of the pad and a pattern cutting prohibited area. Inputting information, providing a second information input step, inputting information of a wiring pattern to be cut and information of a net, and providing a first determining step to cut the wiring pattern to be cut by each input information. Determining a position, and providing a second determination step, wherein when the cutting position is within the pattern cutting prohibition area, the wiring pattern is not in the pattern cutting prohibition area on the same net. Printed circuit board remodeling process method to search the down determining the cutting position on the wiring pattern has been proposed.

Japanese Unexamined Patent Publication No. Hei 4-151773 discloses that when an instruction to cut a wiring pattern passing under a footprint (connection pad) for connecting a terminal of a surface mount component is issued, the lower part of the footprint is automatically set. In the automatic remodeling process of a multilayer printed wiring board by a CAD device, it is determined whether or not a surface mount component is mounted on the remodeling target printed circuit board for the purpose of designating a cutting position in a place other than the above. In the case of component mounting, the shape information and arrangement information of all footprints of the surface mount component are defined in all wiring layers, so that the CAD device recognizes the footprint as a penetrating land, The cutting position is determined based on the pattern and the net information, and it is determined whether the determined cutting position is located within the shape of the footprint. A pattern cutting position designation processing method has been proposed that searches for a wiring pattern on the same net that does not include a cutting portion in the footprint shape when it is located within the print shape and determines it as a cutting position. ing.

[0006]

However, in the above-described conventional design change processing method for a printed wiring board, the wiring cutting position determination processing step and the jumper connection determination processing step are performed by a manual interactive processing. There is a problem that it is easy to occur and inefficient.

The conventional methods proposed in Japanese Patent Application Laid-Open Nos. Hei 4-267483 and Hei 4-151773 only aim to avoid the disconnection of a wiring pattern under a pad. It is possible to cut the wiring at a cutting position such that the surplus wiring length is within a predetermined limit,
No proposal has been made on jumper connection to satisfy a predetermined connection order (single-stroke wiring order).

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to reliably and quickly change the design of a printed wiring board while preventing problems in electrical characteristics and transmission characteristics of a high-speed operation circuit. It is an object of the present invention to provide a printed wiring board design change processing method that can perform the above.

According to the printed wiring board design change processing method of the present invention, as described later, reliability, operability and productivity can be remarkably improved as compared with the conventional method.

[0010] Specifically, the conventional method has a drawback that errors are likely to occur and the quality assurance of the remodeled result is not perfect because the method depends on human labor. However, according to the present invention, the conventional method depends on human labor. Since the working part is automated, the remodeling quality is guaranteed, and the reliability can be significantly improved.

Further, the conventional method has a drawback that the operability is poor because an instruction has to be given in a manual interactive manner for each remodeling part. However, according to the present invention, the remodeling part is automatically determined ( ), The operability can be significantly improved.

Further, the conventional method has a drawback that productivity has to be poor at the time of remodeling because an instruction must be given in a dialogue form by hand. According to the present invention, a remodeling part is automatically determined (instruction). ) Can significantly improve the productivity.

[0013]

In order to achieve the above object, the present invention relates to a processing apparatus for designating a wiring cutting position and / or a jumper connection section for changing the design of a printed wiring board. Limit length information for limiting a distance between component pins connected to the cut wiring (hereinafter referred to as “extra wiring length”), information on a wiring pattern to be cut, net information, and component pin information as design change information Change information input means for inputting, and wiring cut position determination processing means for determining a cut position in a wiring pattern to be cut based on the information input by the change information input means. Wherein the wiring cutting position determination processing means determines the cutting position so as to satisfy the limit length information on the extra wiring length. To provide a change processing method.

According to the present invention, there is provided a processing apparatus for designating a wiring cutting position and / or a jumper connection section in order to change a design of a printed wiring board. And change information input means for inputting component pin information, and jumper connection processing means for determining a jumper connection section based on the information input by the change information input means. A processing unit configured to connect the one or more output pins to the terminating resistor pin via one or more input pins based on the net information and the component pin information (output pin-output pin -...- output pin) -The input pins-the input pins-...-the input pins-the terminating resistor pins in a one-stroke wiring order). To provide a wiring board design change processing method.

With the above-described configuration, according to the printed wiring board design change processing method of the present invention, the wiring cutting position determination processing means includes an extra wiring length restriction processing means, and the wiring cut position determination processing means includes an extra wiring length limiting processing means, and the inside of the net changed from the wiring cutting position. By tracing the wiring pattern, the surplus wiring length to the component pin is obtained, and it is automatically determined whether or not the obtained surplus wiring length is within the surplus wiring length limit value.

In the printed wiring board design change processing method according to the present invention, the jumper connection processing means includes a single-stroke wiring processing means, and the wiring pattern and the jumper wiring are connected in a single-stroke wiring order when determining the jumper connection section. It verifies whether or not it is correct automatically.

As described above, according to the printed wiring board design change processing method of the present invention, the electric characteristics caused by the long extra wiring length can be obtained without performing inefficient instructions manually as in the conventional method. It is possible to quickly and reliably prevent the above problems and problems in transmission characteristics such as undershoots and overshoots caused by the wiring connection order being out of order.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a printed wiring board design change processing method according to an embodiment of the present invention.

Referring to FIG. 1, the printed wiring board design change processing method according to the present embodiment includes an input / output device 6 for inputting / outputting various information (data) necessary for a printed wiring board design change, and A central processing unit for controlling a remodeling processing means 9 for a printed wiring board based on various types of data stored in the storage device 8 in which data input by the output device 6 and design data under design are stored. Processing unit 7
And

The remodeling processing means 9 for the printed wiring board comprises the change information input means 1, the wiring cutting position determination processing means 2, and the jumper connection processing means 4. The wiring cutting position determination processing means 2 includes an extra wiring length restriction processing means 3,
The jumper connection processing means 4 has a single-stroke wiring processing means 5.

FIG. 2 is a diagram showing a configuration example of a printed wiring board library in a printed wiring board design change processing method according to an embodiment of the present invention.

Referring to FIG. 2, the printed wiring board library stores the layer structure of the printed wiring board, component information, pin information, excess wiring length limit value, modification work priority order, and the like.

FIG. 3 is a diagram showing a configuration example of a printed wiring board design file in the printed wiring board design change processing method according to one embodiment of the present invention.

Referring to FIG. 3, the printed wiring board design file stores design information such as wiring cut positions and jumper connection sections in addition to design information such as component mounting information and wiring information.

FIG. 4 is a flowchart for explaining the operation of the printed wiring board design change processing method according to one embodiment of the present invention.

The operation of the printed wiring board design change processing method according to this embodiment will be described below with reference to FIGS.

The change information input means 1 first determines the surplus wiring length limit value (α) based on the printed wiring board library information (see FIG. 2) stored in the storage device 8, the modification work priority order, and the pin number. , And input information such as pin attributes (step 11).

Next, based on the printed wiring board design file (see FIG. 3) stored in the storage device 8, a wiring pattern, net information, and the like are input (step 12), and net change information is extracted. A net that requires remodeling is determined (step 13).

Then, for all the nets requiring remodeling (until YES is determined in step 14), the processing by the wire cutting position determination processing means 2 and the processing by the jumper connection processing means 4 are performed on each of the nets. And processing.

That is, while the determination in step 14 is NO, the wire cutting position determining means 2 selects one of the nets requiring remodeling and based on the information obtained from the change information input means 1, Then, the remodeling section (interconnection cutting section, jumper connection section) is determined as a component pin-component pin section (step 21).

FIG. 5 shows a design change (remodeling work) by a printed wiring board design change processing method according to an embodiment of the present invention.
It is a figure which shows an example of 1 typically.

In the case of the remodeling work example shown in FIG. 5, the remodeling section of the selected net (net e) is such that the wiring cutting section is (pin A1 of component A2)-(input pin c of component A3).
The jumper connection section is (output pin b of component A2)
(The input pin c of the component A3).

Next, the wiring pattern between the (pin P1 of the part A2) and the (input pin c of the part A3), which is the wiring cutting section, is traced, and the cutting position is determined based on the modification work priority order information ( Step 22).

Then, the surplus wiring length from the wiring cutting position to the component pin connected to the wiring to be cut by tracing the wiring pattern is obtained (step 23).

In the case of the remodeling work example shown in FIG. 5, the wiring pattern is traced from the cut point f, and the extra wiring length between the cut point f and the (pin P1 of the component A2), and the cut point f (Extra wiring length between (input pin c of component A3)) is obtained.

Thereafter, each of the obtained extra wiring lengths is compared with the extra wiring length limit value (α) input from the printed wiring board library, and each extra wiring length is set within the extra wiring length limit value (α). It is determined whether or not there is (step 24).

When it is determined in step 24 that the surplus wiring length exceeds the surplus wiring length limit value (α) (NO in step 24).
), The cutting position information is cleared (step 25), and the processing after step 22 is executed again.

On the other hand, when it is determined in step 24 that the surplus wiring length is within the surplus wiring length limit value (α) (step 2).
In the case where YES is determined in Step 4), it is determined whether or not the cutting positions have been determined for all the wiring cut sections (Step 26), and when the wiring cut sections remain (Step 2).
If the determination is NO in step 6), the process returns to step 22 to determine the cutting position for the next wiring cutting section.

On the other hand, if the cutting positions for all the wiring cutting sections have been determined (YES in step 26), the process proceeds to jumper connection processing in step 41 and subsequent steps (step 26).

The jumper connection processing means 4 determines a jumper connection section between the component pin and the component pin, between the component pin and the via, and between the via and the via in accordance with the modification work priority for each of the jumper connection sections to be changed. (Step 41).

In the case of the modification example shown in FIG. 5, the jumper connection section is determined between (output pin b of component A2) and (input pin c of component A3).

After making the jumper connection in this way,
Based on the pin attribute (input / output attribute, that is, the attribute indicating which of the input, output, bidirectional, and terminating resistor) the component pin input from the printed wiring board library by the change information input unit 1. To trace the connection order. At the time of tracing, the wiring pattern and jumper wiring excluding the wiring cutting section are targeted, and the connection order is output pin-output pin -...- output pin-input pin-input pin -...- input pin-termination resistor pin (one stroke). It is determined whether or not the wiring order is satisfied (step 42).

As a result, if the one-stroke wiring order is satisfied (YES in step 43), the next net that requires remodeling is selected, and the processing in step 14 and thereafter is executed again.

On the other hand, if the one-stroke wiring order is not satisfied (NO in step 43), the jumper connection section information is cleared (step 44), and the processes in step 41 and thereafter are executed again.

In the case of the remodeling work shown in FIG. 5, the connection order is (output pin a of component A1)-(output pin b of component A2)-(input pin c of component A3)-(termination). Since it is the resistance pin d), it satisfies the single-stroke wiring order.

After the remodeling process is completed for all the nets that need to be remodeled in accordance with the above-described series of procedures, the change information (the wiring cutting position, the jumper connection section, etc.) is recorded in the printed wiring board design file and updated. (Step 5
0).

Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, but includes various embodiments according to the principle of the present invention.

[0049]

As described above, according to the printed wiring board design change processing method of the present invention, the printed wiring board design is changed (remodeling work) without causing a problem in electrical characteristics and transmission characteristics. Design changes (especially remodeling) of printed wiring boards that are equipped with high-speed operation circuits
Demonstrates power.

Further, according to the printed wiring board design change processing method of the present invention, design change (remodeling work) can be instructed promptly and reliably, so that reliability, operability and production can be improved as compared with the conventional method. The performance can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a printed wiring board design change processing method according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a printed wiring board library in a printed wiring board design change processing method according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration example of a printed wiring board design file in a printed wiring board design change processing method according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of a printed wiring board design change processing method according to an embodiment of the present invention.

FIG. 5 is a diagram schematically showing an example of a design change (wiring cutting work, jumper connecting work in a single-stroke wiring order) by a printed wiring board design change processing method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Change information input means 2 Wiring cut position determination processing means 3 Extra wiring length restriction processing means 4 Jumper connection processing means 5 Single stroke wiring processing means 6 Input / output device 7 Central processing unit 8 Storage device 9 Print wiring board remodeling processing means 11 -14 Internal processing of change information input means 21-26 Internal processing of wiring cut position determination processing means 41-44 Internal processing of jumper connection processing means

Claims (2)

(57) [Claims] 1. A processing device for designating a wiring cutting position and / or a jumper connection section in order to change the design of a printed wiring board, comprising: a distance between a wiring cutting position and a component pin connected to the wiring to be cut; Change information input means for inputting limit length information for limiting the "remaining wiring length", information on a wiring pattern to be cut, net information, and component pin information as design change information; A wire cutting position determination processing means for determining a cutting position in a wiring pattern to be cut based on each of the pieces of information input by the means; The printed wiring board design change processing method, wherein the cutting position is determined so as to satisfy the limited length information on the length. 2. A processing device for designating a wiring cutting position and / or a jumper connection section for performing a design change of a printed wiring board, information on a wiring pattern to be cut, net information and component pin information as design change information. And jumper connection processing means for determining a jumper connection section based on each of the information input by the change information input means, wherein the jumper connection processing means comprises: The jumper connection section is determined based on the net information and the component pin information so as to satisfy a connection order (one-stroke wiring order) from one or a plurality of output pins to a termination resistor pin via one or a plurality of input pins. A printed wiring board design change processing method.